ant-design/components/tree/demo/search.md

---
order: 4
title:
  zh-CN: 可搜索
  en-US: Searchable
---

## zh-CN

可搜索的树。

## en-US

Searchable Tree.

````jsx
import { Tree, Input } from 'antd';

const TreeNode = Tree.TreeNode;

const x = 3;
const y = 2;
const z = 1;
const gData = [];

const generateData = (_level, _preKey, _tns) => {
  const preKey = _preKey || '0';
  const tns = _tns || gData;

  const children = [];
  for (let i = 0; i < x; i++) {
    const key = `${preKey}-${i}`;
    tns.push({ title: key, key });
    if (i < y) {
      children.push(key);
    }
  }
  if (_level < 0) {
    return tns;
  }
  const level = _level - 1;
  children.forEach((key, index) => {
    tns[index].children = [];
    return generateData(level, key, tns[index].children);
  });
};
generateData(z);

const dataList = [];
const generateList = (data) => {
  for (let i = 0; i < data.length; i++) {
    const node = data[i];
    const key = node.key;
    dataList.push({ key, title: key });
    if (node.children) {
      generateList(node.children, node.key);
    }
  }
};
generateList(gData);

const getParentKey = (key, tree) => {
  let parentKey;
  for (let i = 0; i < tree.length; i++) {
    const node = tree[i];
    if (node.children) {
      if (node.children.some(item => item.key === key)) {
        parentKey = node.key;
      } else if (getParentKey(key, node.children)) {
        parentKey = getParentKey(key, node.children);
      }
    }
  }
  return parentKey;
};


class SearchTree extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      expandedKeys: [],
      searchValue: '',
    };
  }
  onExpand = (expandedKeys) => {
    this.setState({ expandedKeys });
  }
  onChange = (e) => {
    const value = e.target.value;
    const expandedKeys = [];
    dataList.forEach((item) => {
      if (item.key.indexOf(value) > -1) {
        expandedKeys.push(getParentKey(item.key, gData));
      }
    });
    const uniqueExpandedKeys = [];
    expandedKeys.forEach((item) => {
      if (item && uniqueExpandedKeys.indexOf(item) === -1) {
        uniqueExpandedKeys.push(item);
      }
    });
    this.setState({
      expandedKeys: uniqueExpandedKeys,
      searchValue: value,
    });
  }
  render() {
    const { searchValue, expandedKeys } = this.state;
    const loop = data => data.map((item) => {
      const index = item.key.search(searchValue);
      const beforeStr = item.key.substr(0, index);
      const afterStr = item.key.substr(index + searchValue.length);
      const title = index > -1 ? (
        <span>
          {beforeStr}
          <span className="ant-tree-searchable-filter">{searchValue}</span>
          {afterStr}
        </span>
      ) : <span>{item.key}</span>;
      if (item.children) {
        return (
          <TreeNode key={item.key} title={title}>
            {loop(item.children)}
          </TreeNode>
        );
      }
      return <TreeNode key={item.key} title={title} />;
    });
    return (
      <div>
        <Input
          style={{ width: 200 }}
          placeholder="Search"
          onChange={this.onChange}
        />
        <Tree
          onExpand={this.onExpand}
          expandedKeys={expandedKeys}
        >
          {loop(gData)}
        </Tree>
      </div>
    );
  }
}

ReactDOM.render(<SearchTree />, mountNode);
````

````css
.ant-tree-searchable-filter {
  color: #f50;
  transition: all .3s ease;
}
````